Who should pay?

I recently ordered a new case for my cellphone from Otterbox, because the old case was getting kind of ragged. This is a good place to tell you that Otterbox makes the best cases in the world for cellphones - I have dropped my phone in its case 15 feet onto cement, and nothing happened to it at all. More than once.

So when my brand new case arrived, I excitedly opened the box - only to find they shipped me the wrong case. $ 40 worth of the wrong case. I can return it, but they want me to pay $5 to ship the wrong one back to them, and therein lies the issue.

I already paid one-way shipping for the wrong one so why the fuck am I obligated to pay for shipping it back since it was their mistake? It isn't the $5 that bothers me - it is the principle of the thing. I will call them on Tuesday to hash this out - but what do you think?
They should pay
You should pay
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